Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Continuous Symmetries and Approximate Quantum Error Correction
P. Faist, Sepehr Nezami, Victor V. Albert +4 more·Feb 20, 2019
Quantum error correction and symmetry arise in many areas of physics, including many-body systems, metrology in the presence of noise, fault-tolerant computation, and holographic quantum gravity. Here, we study the compatibility of these two importan...
Multi-matrix error estimation and reconciliation for quantum key distribution.
Chaohui Gao, Dong Jiang, Yu Guo +1 more·Feb 14, 2019
Post-processing is a significant step in quantum key distribution (QKD), which is used for correcting the quantum-channel noise errors and distilling identical corrected keys between two distant legitimate parties. Efficient error reconciliation prot...
Detecting itinerant microwave photons with engineered non-linear dissipation
R. Lescanne, S. Del'eglise, E. Albertinale +6 more·Feb 13, 2019
Single photon detection is a key resource for sensing at the quantum limit and the enabling technology for measurement based quantum computing. Photon detection at optical frequencies relies on irreversible photo-assisted ionization of various natura...
Continuous-time Quantum Error Correction with Noise-assisted Quantum Feedback
G. Cardona, A. Sarlette, P. Rouchon·Jan 31, 2019
We address the standard quantum error correction using the three-qubit bit-flip code, yet in continuous-time. This entails rendering a target manifold of quantum states globally attractive. Previous feedback designs could feature spurious equilibria,...
Noise-Adaptive Compiler Mappings for Noisy Intermediate-Scale Quantum Computers
Prakash Murali, Jonathan M. Baker, Ali Javadi-Abhari +2 more·Jan 30, 2019
A massive gap exists between current quantum computing (QC) prototypes, and the size and scale required for many proposed QC algorithms. Current QC implementations are prone to noise and variability which affect their reliability, and yet with less t...
Decoding surface code with a distributed neural network–based decoder
Savvas Varsamopoulos, K. Bertels, C. G. Almudéver·Jan 30, 2019
There has been a rise in decoding quantum error correction codes with neural network–based decoders, due to the good decoding performance achieved and adaptability to any noise model. However, the main challenge is scalability to larger code distance...
Heisenberg-limited single-mode quantum metrology in a superconducting circuit
Wei Wang, Yi Wu, Yi Wu +12 more·Jan 28, 2019
Two-mode interferometers lay the foundations for quantum metrology. Instead of exploring quantum entanglement in the two-mode interferometers, a single bosonic mode also promises a measurement precision beyond the shot-noise limit (SNL) by taking adv...
Demonstration of a parametrically activated entangling gate protected from flux noise
Sabrina Hong, A. Papageorge, P. Sivarajah +7 more·Jan 23, 2019
In state-of-the-art quantum computing platforms, including superconducting qubits and trapped ions, imperfections in the 2-qubit entangling gates are the dominant contributions of error to system-wide performance. Recently, a novel 2-qubit parametric...
Quantum Computing with Rotation-Symmetric Bosonic Codes
A. Grimsmo, J. Combes, B. Baragiola·Jan 23, 2019
Bosonic rotation codes, introduced here, are a broad class of bosonic error-correcting codes based on phase-space rotation symmetry. We present a universal quantum computing scheme applicable to a subset of this class--number-phase codes--which inclu...
Neural Decoder for Topological Codes using Pseudo-Inverse of Parity Check Matrix
C. Chinni, Abhishek Kulkarni, Dheeraj M. Pai +2 more·Jan 21, 2019
Recent developments in the field of deep learning have motivated many researchers to apply these methods to problems in quantum information. Torlai and Melko first proposed a decoder for surface codes based on neural networks. Since then, many other ...
Single-Shot Readout Performance of Two Heterojunction-Bipolar-Transistor Amplification Circuits at Millikelvin Temperatures
M. Curry, M. Curry, Martin Rudolph +15 more·Jan 14, 2019
High-fidelity single-shot readout of spin qubits requires distinguishing states much faster than the T1 time of the spin state. One approach to improving readout fidelity and bandwidth (BW) is cryogenic amplification, where the signal from the qubit ...
Quantum-error-correction-assisted quantum metrology without entanglement
K. C. Tan, S. Omkar, H. Jeong·Jan 11, 2019
In this article we study the role that quantum resources play in quantum error correction assisted quantum metrology (QECQM) schemes. We show that there exist classes of such problems where entanglement is not necessary to retrieve noise free evoluti...
Sensitivity of quantum speedup by quantum annealing to a noisy oracle
Siddharth Muthukrishnan, T. Albash, Daniel A. Lidar·Jan 10, 2019
The glued-trees problem is the only example known to date for which quantum annealing provides an exponential speedup, albeit by partly using excited state evolution, in an oracular setting. How robust is this speedup to noise on the oracle? To answe...
Quantum error correction in multi-parameter quantum metrology
Wojciech Górecki, Sisi Zhou, Liang Jiang +1 more·Jan 3, 2019
We derive a necessary and sufficient condition for the possibility of preserving the Heisenberg scaling in general adaptive multi-parameter estimation schemes in presence of Markovian noise. In situations where the Heiseneberg scaling can be preserve...
Circuit optimization for IBM processors: A way to get higher fidelity and higher values of nonclassicality witnesses
M. Sisodia, A. Shukla, Alexandre A. A. de Almeida +2 more·Dec 30, 2018
Recently, various quantum computing and communication tasks have been implemented using IBM's superconductivity-based quantum computers which are available on the cloud. Here, we show that the circuits used in most of those works were not optimized a...
Ptychography of pure quantum states
M. F. Fernandes, Leonardo Neves·Dec 29, 2018
Ptychography is an imaging technique in which a localized illumination scans overlapping regions of an object and generates a set of diffraction intensities used to computationally reconstruct its complex-valued transmission function. We propose a qu...
Towards long-distance quantum networks with superconducting processors and optical links
Sourabh Kumar, N. Lauk, C. Simon·Dec 20, 2018
We design a quantum repeater architecture, necessary for long distance quantum networks, using the recently proposed microwave cat state qubits, formed and manipulated via interaction between a superconducting nonlinear element and a microwave cavity...
Error Mitigation in Quantum Computers subject to Spatially Correlated Noise
Vickram N. Premakumar, R. Joynt·Dec 17, 2018
The most common error models for quantum computers assume the independence of errors on different qubits. However, most noise mechanisms have some correlations in space. We show how to improve quantum information processing for few-qubit systems when...
Long-distance continuous-variable measurement-device-independent quantum key distribution with discrete modulation
Hongxin Ma, Peng Huang, Dongyun Bai +4 more·Dec 13, 2018
We propose a long-distance continuous-variable measurement-device-independent quantum key distribution (CV-MDI-QKD) protocol with discrete modulation. This kind of discrete-modulated schemes have good compatibility with efficient error correction cod...
The role of entropy in topological quantum error correction
M. Beverland, Benjamin J. Brown, M. Kastoryano +1 more·Dec 12, 2018
The performance of a quantum error-correction process is determined by the likelihood that a random configuration of errors introduced to the system will lead to the corruption of encoded logical information. In this work we compare two different var...